Oh! BTW, The shredding noise is not noticeable or present when I change gears like in a manual trans, I mean, releasing the foot from gas then changing gear, then pressing gas pedal again. But, I didn't pick an AT to do manual gear changes if you know what I mean.

Anyway, I hope my findings might give you a better idea of what's happening and when it gets solved (finger crossed) it might also help others in the same situation.

Greetings

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BMW X5 2002 4.4i V8 - What a headache!!!
BMW X5 2019 XLine 3.0D - Loving it